Improvement in boilers for heating



J. G. WILSON.

Domstic Boiler.

Patented Jan. 10,1871

N. PETERS. FHQWLITHOGRAPMER WASiln mTDN, D. Q

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ititiiizil %iaia JOHN G. WILSON, or NEW YORK, liar.-

Letters Patent No. 110,884, dated. January 10,1871,

IMPROVEMENT m'lsoirsns FOR HEATING.

The Schedule referred to in these Letters Patent and part of the saine.

liar shape of the two shells of which the boiler is composed, to make a cheap and eifective boiler.-

The second part consists in a novel bottom joint,

by whichthe two shells are connected, which joint is not alone adaptable to my boiler, but also to all cast- -iron boilers for heating purposes now being manufactured.

Description of the Accompanying Drawing. Figure 1 is a vertical section of the boiler in line x x of fig. 3.

Figure 2, a vertical section thereof in line 3 y of f :1

Figure 3, a horizontal section thereof in line 5 of Figure 4, a vertical section of a boiler with a bottom joint made in the ordinary manner.

All cast-iron boilers for heating purposes are composed of two shells-an inner and an outer shell. The space between thetwo shells is tilled with water, and the fire is inside the inner shell; and, in order to increase the tire-surface of the inner shell, many devices have been resorted to, most of which require the same to be composed of many parts, which necessitates separate joints. To avoid this, and construct an effective and economical boiler with not more than three joints, 1 make the inner shell a corrugated, the corrugations running over the top of the shell a, and down the sides to somewhere near-the bottom edge, where the said shell a terminates in plain elliptic form.

The outer shell 0 is of a plain elliptic shape, rounded on top, and conforming with the general outline of the inner shell, but without. corrugations, leaving a water-space between the two shells.

The manner of jointing the outer and inner shells heretofore adopted exolusivelycousists, as shown in fig. 4., in furnishing each shell, at its bottom edge, with a horizontal flange, which flanges aretheu riveted or bolted together, and calked. I

My improved mode of jointing the two shells together does away with all bolts and rivet-s, and consists in providing a vertical groove at the lower portion of the inner 'shell to by casting all around it aver-- tical rim, a, concentric with the shell (I, and the bottom edge of the outer shell I) is placed into the aforesaid groove, and there calkcd with iron cement, thus making a water-tight. joint.

- Both shells are made with a corresponding aperture, a and W, for the fire-door, and the joint around this aperture isui'ade in the ordinary manner.

The smoke-pipe dis cast together with the inner shell 0, and ought to be as far to the rear as possible, and passes through a nozzle, 0', east onto the outer shell, where it is jointed by calking, also in the ordinary manner.

The hot water passes oii' through a nozzle, f, at the top of the outer shell, and returns back into the boiler by a nozzle, g, at the lower portion of the outer shell.

Both shells so jointed and placed-upon a cast-iron base, 7:, that will serve as an ash pit, make a cheap and eifective portable boiler, andrequires no masonry.

By forming the tops of the outer shell so as to ai ford a steam-space, the apparatus can be made to serve as a stcani-boilerfor heating purposes.

I claim as my inventionv1. A boiler composed of a plain elliptic outside shell and a corrugated inside shell, being jointed at their bottom edges, around the aperture for the firedoor, and around the smoke-pipe, substantially as described.

2. The manner of forming a bottom joint between the outer and inner shells of a cast-iron boiler, substantially as specified.

JOHN G. \VILSON..

Witnesses:

ALBERT H. H0011, R. O. Ovnnrrou. 

